CN113504476A - Power battery peak power testing method, device and system - Google Patents
Power battery peak power testing method, device and system Download PDFInfo
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Abstract
The invention discloses a power battery peak power testing scheme, a device and a system. The power battery peak power testing method comprises the following steps: determining test power, a voltage limit value and test duration; performing constant power test on the battery based on the test power, recording the voltage of the battery in the constant power test process, and reducing the test power if the voltage reaches a voltage limit value within the test time; if the voltage does not reach the voltage limit value after the duration of the constant power test reaches the test duration, the test power is improved; continuously adjusting the test power, and repeatedly performing constant power test by using the adjusted test power until the difference value between the voltage and the voltage limit value is within a set range just after the test duration is reached; and taking the test power when the difference value between the voltage and the voltage limit value is within the set range right after the test duration is reached as the peak power.
Description
Technical Field
The embodiment of the invention relates to a battery testing technology, in particular to a method, a device and a system for testing the peak power of a power battery.
Background
The power battery can be used as a power supply of tools such as electric automobiles, electric equipment and the like, and in the field of electric automobiles, the requirements for the battery also have certain differences for different types of vehicles. For a hybrid vehicle, a battery is mainly used for power supplement of the vehicle, so that relatively large input and output power is required to ensure that the output power of the vehicle can be effectively supplemented or the energy recovery of braking can be realized.
The maximum input power and the maximum output power of the battery within a certain time are called peak power, and in the application process, the battery with the specified peak power should be selected according to the actual working condition scene. Currently, methods of measuring the peak power of the battery include JEVS power tests, HPPC tests, and the like. However, the above test methods all have some disadvantages, including: the test is long in time consumption, low in test efficiency, easy to damage the battery in the test process and the like.
Disclosure of Invention
The invention provides a method, a device and a system for testing the peak power of a power battery, which aim to quickly and effectively determine the peak power of the battery.
In a first aspect, an embodiment of the present invention provides a method for testing a peak power of a power battery, where the method includes determining a test power, a voltage limit, and a test duration;
performing constant power test on the battery based on the test power, recording the voltage of the battery in the constant power test process, and reducing the test power if the voltage reaches the voltage limit value within the test time;
if the voltage does not reach the voltage limit value after the duration of the constant power test reaches the test duration, the test power is improved;
continuously adjusting the test power, and repeatedly performing the constant power test by using the adjusted test power until the difference value between the voltage and the voltage limit value is in a set range just after the test duration is reached;
and taking the test power when the difference value of the voltage and the voltage limit value is in a set range right after the test duration is reached as the peak power.
Further, the method also comprises the steps of determining a target SOC value;
the constant power test is used to determine the peak power at each of the target SOC values.
Further, determining a maximum current corresponding to the target SOC value, and an open-circuit voltage corresponding to the target SOC value;
and determining the test power corresponding to the target SOC value according to the maximum current and the open-circuit voltage.
Further, determining the highest voltage of the battery before the constant power test;
if the voltage reaches the voltage limit value within the test time length, recording the time length when the voltage reaches the voltage limit value as a first time length;
and determining the reduced test power when the next constant power test is carried out according to the test power corresponding to the current constant power test, the voltage limit value, the highest voltage and the first time length.
Further, determining the highest voltage of the battery before the constant power test;
if the voltage does not reach the voltage limit value after the duration of the constant power test reaches the test duration, recording the current voltage as a first voltage;
and determining the improved test power when the next constant power test is carried out according to the test power corresponding to the current constant power test, the voltage limit value, the highest voltage and the first voltage.
Further, the method also comprises the step of controlling the ambient temperature to be stabilized at the target temperature.
Further, the method also comprises the step of determining the initial capacity of the battery.
Further, the set range is 0.01V or less.
In a second aspect, an embodiment of the present invention further provides a power battery peak power testing apparatus, which is characterized in that the apparatus includes a peak power testing unit, where the peak power testing unit is configured to:
determining test power, a voltage limit value and test duration;
performing constant power test on the battery based on the test power, recording the voltage of the battery in the constant power test process, and reducing the test power if the voltage reaches the voltage limit value within the test time;
if the voltage does not reach the voltage limit value after the duration of the constant power test reaches the test duration, the test power is improved;
continuously adjusting the test power, and repeatedly performing the constant power test by using the adjusted test power until the difference value between the voltage and the voltage limit value is within a set range just after the test duration is reached;
and taking the test power when the difference value between the voltage and the voltage limit value is in a set range right after the test duration is reached as the peak power.
In a third aspect, an embodiment of the present invention further provides a power battery peak power test system, which includes a controller, where the controller is configured to implement the power battery peak power test method described in the embodiment.
Compared with the prior art, the invention has the beneficial effects that:
1. the power battery peak power testing method determines the peak power through the constant power test, in the testing process, whether the testing duration is reached or within the testing duration and whether the voltage of the battery reaches the limit value are taken as the basis for finishing the constant power test once, the duration of the core step of each constant power test does not exceed the set testing duration, and the total duration of the peak power test can be greatly reduced;
2. the method for testing the peak power of the power battery judges whether the current test power can be used as the peak power of the battery by judging whether the voltage of the battery is just changed to a set voltage limit value after the test time is long, and determines the test power used for the next constant power test based on the measured voltage of the battery and the set voltage limit value when the peak power cannot be determined by one constant power test, so that the test power used for the next constant power test can be close to the peak power to the maximum extent, the times of repeated constant power tests are reduced to the maximum extent, and the test efficiency is improved;
3. the method for testing the peak power of the power battery can be effectively applied to general evaluation of the peak power performance of self-researched products or platform projects, the limit charge and discharge power of the battery under different set conditions can be tested, when a customer has an exact power requirement, the test result determined by the method can be used as a basis for early comparison, and the customer can conveniently and initially evaluate whether the product meets the requirement.
Drawings
FIG. 1 is a flow chart of a power battery peak power test method in an embodiment;
FIG. 2 is a flow chart of a method for testing peak power of a power battery in an embodiment;
FIG. 3 is a flow chart of another method for testing peak power of a power battery in an embodiment;
FIG. 4 is a block diagram of a power battery peak power test system in an embodiment.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a peak power testing method of a power battery in an embodiment, and referring to fig. 1, the embodiment provides a peak power testing method of a power battery, including:
s101, setting test duration, carrying out constant power test on the battery, and taking the current test power as the peak power of the battery if the voltage of the battery just changes to a set range after the test duration.
Illustratively, constant power testing refers to testing power being constant for a single test.
For example, the peak power determined in this step is the peak power of a specified condition, and the specified condition may be a specified SOC (State of Charge) value, a specified temperature, a specified SOC value, and the like.
Fig. 2 is a flowchart of a method for testing peak power of a power battery in an embodiment, and based on the above, referring to fig. 2, step S101 may further include:
s1011, setting test duration, test power, a target test SOC value and a target test temperature value.
And S1012, carrying out constant power test on the battery within the test time, and taking the current test power as the peak power of the battery if the voltage of the battery just changes to a set range after the test time is long.
And S1013, adjusting the target test SOC value and the target test temperature value, and re-performing the step S1012 to determine the peak power under the current specified condition.
In this embodiment, assuming that the test duration is 10s, to determine the peak power in the battery charging process at 25 ℃ and 80% SOC value; the peak power determination process will be described with reference to the peak power during the battery discharge at 25 ℃ and 30% SOC.
Specifically, the process of determining the peak power in the battery charging process includes:
fully charging the battery according to a specified charging mode or with 1C charging current, standing for 1h, discharging at a constant current of 1C (100-80)/100h, namely discharging for 0.2h, and adjusting the SOC of the battery to 80% SOC;
adjusting the temperature of the test environment to 25 ℃, and standing the battery to ensure that the temperature difference between the battery temperature and the test environment is not more than 2 ℃;
determining an initial power P0Based on the initial power P0Carrying out constant power test on the battery, and recording the voltage of the battery in the constant power test process;
if the voltage of the battery just changes to the set range after the duration of the constant power test reaches 10s, the current initial power P is added0As the peak power of the battery.
Illustratively, the peak power during battery charging is determined using an upper limit voltage U determined by the battery during designupper_limitThe set range is determined.
For example, the above-mentioned range may be Uupper_limit±0.01V。
The process of determining peak power during discharge of the battery includes:
fully charging the battery according to a specified charging mode or with 1C charging current, standing for 1h, discharging at a constant current of 1C (100-30)/100h, namely discharging for 0.7h, and adjusting the SOC of the battery to 30% SOC;
adjusting the temperature of the test environment to 25 ℃, and standing the battery to ensure that the temperature difference between the battery temperature and the test environment is not more than 2 ℃;
determining an initial power P0Based on the initial power P0Carrying out constant power test on the battery, and recording the voltage of the battery in the constant power test process;
if the voltage of the battery just changes to the set range after the duration of the constant power test reaches 10s, the current initial power P is added0As the peak power of the battery.
Illustratively, the lower limit voltage U determined during design is utilized by the battery in determining the peak power during battery charginglower_limitThe set range is determined.
For example, the above-mentioned range may be Ulower_limit±0.01V。
Illustratively, in the above test procedure, the initial power P0May be a random value.
As a preferable scheme, in this embodiment, the initial power P is determined based on the maximum current corresponding to a certain SOC value and the open-circuit voltage determined in the battery design process0When the peak power of the single battery is tested, the formula adopted by the method is as follows:
P0＝Isoc×Usoc
in the formula IsocIs the maximum current, U, corresponding to a certain SOC valuesocIs the open circuit voltage at this SOC value.
Exemplary, when determining peak power during battery charging, IsocMaximum current, U, corresponding to 80% SOCsocOpen circuit voltage corresponding to 80% SOC; when determining the peak power during discharge of the battery, IsocMaximum current, U, corresponding to 30% SOCsocCorresponding to 30% SOCThe open circuit voltage.
Illustratively, if the peak power of the battery pack is tested, the initial power P is determined0The formula adopted is as follows:
P0＝Isoc×Usoc×M×N
in the formula IsocIs the maximum current, U, corresponding to a certain SOC valuesocFor the open-circuit voltage at the SOC value, M is the number of all battery units in the battery pack connected in parallel, and N is the number of all cells in each battery unit connected in series.
Illustratively, the peak power of the battery pack is determined in the same manner as the peak power of the battery cells.
For example, in the present embodiment, the case where the voltage of the battery after the test time period cannot be changed to the set range in correspondence with the case where the voltage of the battery after the test time period is changed to the set range includes:
before the time length reaches the testing time length, the voltage of the battery is changed to be within a set range, for example, the voltage of the battery is changed to be within the set range at 5 s;
by the end of the test period, the voltage of the battery is not changed to be within the set range.
Illustratively, in the constant power test process, the duration of the constant power test and the voltage of the battery in the constant power test process are recorded, and then whether the voltage of the battery just changes to a set range after the duration of the test is judged.
S102, if the peak power of the battery cannot be determined through the primary constant power test, adjusting the test power according to set conditions, and immediately repeating the primary constant power test after adjusting the primary test power until the peak power of the battery is determined.
In this step, the adjusting of the test power according to the setting condition may be, for example, randomly adjusting the value of the test power, and increasing or decreasing the value of the test power according to a fixed step length.
Fig. 3 is a flowchart of another power battery peak power testing method in the embodiment, referring to fig. 3, as a preferred solution, in this embodiment, the step S102 may further include increasing or decreasing the value of the testing power according to a fixed step size:
s1021, aiming at the last constant power test, if the voltage of the battery reaches a voltage limit value within the test time, reducing the test power when the current constant power test is carried out;
and if the voltage of the battery does not reach the voltage limit value after the duration of the constant power test reaches the test duration, improving the test power when the current constant power test is carried out.
S1022, repeating the step S1021 until the difference value between the voltage of the battery and the voltage limit value is within a set range just after the test duration is reached.
Specifically, in this embodiment, the test power is adjusted in the following manner, and the subsequent peak power test process is completed.
Configuring a first testing link, namely:
determining the test power P required by the testiBased on the test power PiCarrying out constant power test on the battery, and recording the voltage of the battery in the constant power test process, wherein the test power PiThe determination method comprises the following steps:
configuring a second testing link, namely:
determining the test power P required by the testiBased on the test power PiCarrying out constant power test on the battery, and recording the voltage of the battery in the constant power test process, wherein the test power PiThe determination method comprises the following steps:
and configuring a third testing link, namely:
determining the test power P required by the testiBased on the test power PiCarrying out constant power test on the battery, and recording the voltage of the battery in the constant power test process, wherein the test power PiThe determination method comprises the following steps:
and configuring a fourth testing link, namely:
determining the test power P required by the testiBased on the test power PiCarrying out constant power test on the battery, and recording the voltage of the battery in the constant power test process, wherein the test power PiThe determination method comprises the following steps:
in the above formulas, U represents the voltage of the battery when the duration reaches the test duration, t is the test duration, t1And (3) the corresponding time length (first time length) when the voltage of the battery is changed to be within the set range before the testing time length is reached.
Illustratively, during the charge test phase, U0The highest voltage of the battery measured under specified conditions (a certain SOC value, a certain temperature and the like) before the constant power test is carried out; in the discharge test phase, U0The lowest voltage of the cell measured under the specified conditions was determined before the constant power test was performed.
Illustratively, the first test segment and the third test segment are used for increasing the test power, and the second test segment and the fourth test segment are used for reducing the test power.
If the battery is in the charging process, based on the initial power P0Performing constant power test on the battery, and stopping until the test duration is terminated, wherein the voltage of the battery is less than the upper limit voltage Uupper_limitThen continuing to determine the peak power during battery charging includes:
fully charging the battery according to a specified charging mode or with 1C charging current, standing for 1h, discharging at a constant current of 1C (100-80)/100h, namely discharging for 0.2h, and adjusting the SOC of the battery to 80% SOC;
adjusting the temperature of the test environment to 25 ℃, and standing the battery to ensure that the difference between the temperature of the battery and the test environment is not more than 2 ℃;
executing a first testing link;
if the voltage of the battery just changes to the set range after the duration of the constant power test reaches 10s, the current test power P is changediAs the peak power of the battery;
and if the peak power of the battery cannot be determined after the constant power test, repeating the constant power test.
If the voltage of the battery is not changed to the set range all the time after the current constant power test is finished and the termination time of the test duration is reached, executing a first test link after the test environment temperature is adjusted during the next constant power test, and further finishing the current constant power test;
if the voltage of the battery is changed to be within the set range before the time length reaches the test time length when the current constant power test is finished, executing a second test link after the test environment temperature is adjusted when the next constant power test is carried out, and further finishing the current constant power test;
and continuously adjusting the test power according to the strategy, and repeatedly performing constant power test by using the adjusted test power until the peak power is determined.
If the battery is in the charging process, based on the initial power P0The constant power test is carried out on the battery, and the voltage of the battery is changed to U before the duration reaches the test durationupper_limitThen continuing to determine the peak power during battery charging includes:
fully charging the battery according to a specified charging mode or with 1C charging current, standing for 1h, discharging at a constant current of 1C (100-80)/100h, namely discharging for 0.2h, and adjusting the SOC of the battery to 80% SOC;
adjusting the temperature of the test environment to 25 ℃, and standing the battery to ensure that the difference between the temperature of the battery and the test environment is not more than 2 ℃;
executing a second testing link;
if the voltage of the battery just changes to the set range after the duration of the constant power test reaches 10s, the current test power P is changediAs the peak power of the battery;
if the peak power of the battery cannot be determined after the constant power test, according to the above strategy, when the next constant power test is performed, the first test link or the second test link is selected correspondingly, the test power is continuously adjusted, and the constant power test is performed repeatedly by using the adjusted test power until the peak power is determined.
If the battery is discharged, based on the initial power P0Performing constant power test on the battery, and stopping until the test duration is over, wherein the voltage of the battery is greater than the lower limit voltage Ulower_limitThen continuing to determine the peak power during battery charging includes:
fully charging the battery according to a specified charging mode or with 1C charging current, standing for 1h, discharging at a constant current of 1C (100-30)/100h, namely discharging for 0.7h, and adjusting the SOC of the battery to 30% SOC;
adjusting the temperature of the test environment to 25 ℃, and standing the battery to ensure that the difference between the temperature of the battery and the test environment is not more than 2 ℃;
executing a third testing link;
if the voltage of the battery just changes to the set range after the duration of the constant power test reaches 10s, the current test power P is changediAs the peak power of the battery;
and if the peak power of the battery cannot be determined after the constant power test, repeating the constant power test.
If the voltage of the battery is not changed to the set range all the time after the current constant power test is finished and the termination time of the test duration is reached, then a third test link is executed after the test environment temperature is adjusted during the next constant power test, and the current constant power test is finished;
if the voltage of the battery is changed to be within the set range before the time length reaches the test time length when the current constant power test is finished, executing a fourth test link after the test environment temperature is adjusted when the next constant power test is carried out, and further finishing the current constant power test;
and continuously adjusting the test power according to the strategy, and repeatedly performing constant power test by using the adjusted test power until the peak power is determined.
If the battery is discharged, based on the initial power P0The constant power test is carried out on the battery, and the voltage of the battery is changed to the lower limit voltage U before the duration reaches the test durationlower_limitThen continuing to determine the peak power during battery discharge comprises:
fully charging the battery according to a specified charging mode or with 1C charging current, standing for 1h, discharging at a constant current of 1C (100-30)/100h, namely discharging for 0.7h, and adjusting the SOC of the battery to 30% SOC;
adjusting the temperature of the test environment to 25 ℃, and standing the battery to ensure that the difference between the temperature of the battery and the test environment is not more than 2 ℃;
executing a fourth testing link;
if the voltage of the battery just changes to the set range after the duration of the constant power test reaches 10s, the current test power P is changediAs the peak power of the battery;
if the peak power of the battery cannot be determined after the constant power test, according to the strategy, when the next constant power test is performed, the third test link or the fourth test link is correspondingly selected, the test power is continuously adjusted, and the constant power test is repeatedly performed by using the adjusted test power until the peak power is determined.
The method for testing the peak power of the power battery provided by the embodiment determines the peak power through the constant power test, in the test process, whether the test duration is reached or within the test duration and whether the voltage of the battery reaches the limit value are taken as the basis for finishing the constant power test once, the duration of the core step of performing the constant power test each time does not exceed the set test duration, and the total duration of the peak power test can be greatly reduced;
according to the method for testing the peak power of the power battery, whether the voltage of the battery just changes to the set voltage limit value or not after the test time is long is judged, whether the current test power can be used as the peak power of the battery or not is judged, and when the peak power cannot be determined through one-time constant power test, the test power used for the next constant power test is determined based on the measured voltage of the battery and the set voltage limit value, so that the test power used for the next constant power test can be close to the peak power to the maximum extent, the number of times of repeated constant power tests is reduced to the maximum extent, and the test efficiency is improved;
the method for testing the peak power of the power battery can be effectively applied to general evaluation of the peak power performance of self-researched products or platform projects, the limit charge and discharge power of the battery under different set conditions can be measured, when a customer has an exact power requirement, a test result determined by the method can be used as a basis for early comparison, and the customer can conveniently and initially evaluate whether the product meets the requirement.
As an implementation scheme, before the constant power test is carried out, the initial capacity of the battery can be determined to determine the accurate battery capacity, and then the initial power P is determined when the maximum current corresponding to a certain SOC value and the open-circuit voltage are adopted0Increasing the initial power P0The accuracy of the test is improved, and the test time is further shortened.
Example two
The embodiment provides a power battery peak power testing device, which includes a peak power testing unit, where the peak power testing unit is configured to:
determining test power, a voltage limit value and test duration;
performing constant power test on the battery based on the test power, recording the voltage of the battery in the constant power test process, and reducing the test power if the voltage reaches the voltage limit value within the test time;
if the voltage does not reach the voltage limit value after the duration of the constant power test reaches the test duration, the test power is improved;
continuously adjusting the test power, and repeatedly performing the constant power test by using the adjusted test power until the difference value between the voltage and the voltage limit value is within a set range just after the test duration is reached;
and taking the test power when the difference value between the voltage and the voltage limit value is in a set range right after the test duration is reached as the peak power.
Specifically, in this embodiment, the power testing method configured by the power battery peak power testing apparatus may be any one of the power battery peak power testing methods described in the first embodiment, and the specific implementation method thereof is not described again.
In this embodiment, the beneficial effects achieved by the peak power testing device based on the power battery are the same as those described in the first embodiment.
EXAMPLE III
For example, the method for testing the peak power of the power battery provided in the first embodiment may be implemented in a software manner.
Fig. 4 is a block diagram of a power battery peak power testing system in an embodiment, and referring to fig. 4, the embodiment provides a power battery peak power testing system, which includes a controller 100 configured with an executable program, and the executable program is used for implementing any one of the power battery peak power testing methods described in the first embodiment.
Referring to fig. 2, the power battery peak power testing system may further include an ammeter 200, a voltmeter 300, a thermometer 400, a timer 500, and the like.
Illustratively, an ammeter 200, a voltmeter 300 and a thermometer 400 are respectively connected with the controller 100 and the battery U1, the ammeter 200 is used for measuring and sending the charging and discharging current of the battery U1 to the controller 100, the voltmeter 300 is used for measuring and sending the voltage of the battery U1 to the controller 100, and the thermometer 400 is used for measuring and sending the temperature of the battery U1 to the controller.
The timer 500 is connected to the controller 100, and the timer 500 is used for timing.
The beneficial effects of the power battery peak power testing system provided in this embodiment are the same as those described in the first embodiment.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A power battery peak power test method is characterized in that test power, a voltage limit value and test duration are determined;
performing constant power test on the battery based on the test power, recording the voltage of the battery in the constant power test process, and reducing the test power if the voltage of the battery reaches the voltage limit value within the test time;
if the voltage of the battery does not reach the voltage limit value after the duration of the constant power test reaches the test duration, the test power is improved;
continuously adjusting the test power, and repeatedly performing the constant power test by using the adjusted test power;
and taking the test power when the difference value between the voltage of the battery and the voltage limit value is in a set range right after the test duration is reached as the peak power.
2. The method for testing peak power of a power battery as claimed in claim 1, further comprising determining a target SOC value;
the constant power test is used to determine the peak power at each of the target SOC values.
3. The peak power test method for the power battery according to claim 2, characterized in that the maximum current corresponding to the target SOC value and the open-circuit voltage corresponding to the target SOC value are determined;
and determining the test power corresponding to the target SOC value according to the maximum current and the open-circuit voltage.
4. The method for testing the peak power of the power battery according to claim 1, wherein the highest voltage of the battery before the constant power test is carried out is determined;
if the voltage of the battery reaches the voltage limit value within the test time length, recording the time length when the voltage of the battery reaches the voltage limit value as a first time length;
and determining the reduced test power when the next constant power test is carried out according to the test power corresponding to the current constant power test, the voltage limit value, the highest voltage and the first time length.
5. The method for testing the peak power of the power battery according to claim 1, wherein the highest voltage of the battery before the constant power test is carried out is determined;
if the voltage of the battery does not reach the voltage limit value after the duration of the constant power test reaches the test duration, recording the current voltage of the battery as a first voltage;
and determining the improved test power when the next constant power test is carried out according to the test power corresponding to the current constant power test, the voltage limit value, the highest voltage and the first voltage.
6. The method for peak power testing of a power battery as claimed in claim 1, further comprising controlling the ambient temperature to stabilize at the target temperature.
7. The method for peak power testing of a power battery of claim 1, further comprising determining an initial capacity of the battery.
8. The method for testing the peak power of the power battery as claimed in claim 1, wherein the set range is less than or equal to 0.01V.
9. The peak power testing device for the power battery is characterized by comprising a peak power testing unit, wherein the peak power testing unit is used for:
determining test power, a voltage limit value and test duration;
performing constant power test on the battery based on the test power, recording the voltage of the battery in the constant power test process, and reducing the test power if the voltage of the battery reaches the voltage limit value within the test time;
if the voltage of the battery does not reach the voltage limit value after the duration of the constant power test reaches the test duration, the test power is improved;
continuously adjusting the test power, and repeatedly performing the constant power test by using the adjusted test power until the difference between the voltage of the battery and the voltage limit value is within a set range just after the test duration is reached;
and taking the test power when the difference value between the voltage of the battery and the voltage limit value is in a set range right after the test duration is reached as the peak power.
10. A power battery peak power testing system, characterized by comprising a controller, wherein the controller is used for implementing the power battery peak power testing method of any one of claims 1 to 8.
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